[Webkit-unassigned] [Bug 102449] New: Coordinated Graphics: Remove a texture if an direct composited image is off the viewport.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102449

           Summary: Coordinated Graphics: Remove a texture if an direct
                    composited image is off the viewport.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


Currently, once uploading textures for composited images, Coordinated Graphics 
does not release the textures until all layers using images are destroyed. 

This patch removes a texture if we don't need to render an image. This mechanism
is similar how TiledBackingStore removes invisible tiles.

When all layers are invisible, we wait 3 seconds to remove the image, because we
want to prevent a transform animation from creating and destroying a texture
over and over again.

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